tools/usb/usbip/src/utils.c

   1 /*
   2  * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
   3  *               2005-2007 Takahiro Hirofuchi
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22
  23 #include "usbip_common.h"
  24 #include "utils.h"
  25 #include "sysfs_utils.h"
  26
  27 int modify_match_busid(char *busid, int add)
  28 {
  29         char attr_name[] = "match_busid";
  30         char command[SYSFS_BUS_ID_SIZE + 4];
  31         char match_busid_attr_path[SYSFS_PATH_MAX];
  32         int rc;
  33         int cmd_size;
  34
  35         snprintf(match_busid_attr_path, sizeof(match_busid_attr_path),
  36                  "%s/%s/%s/%s/%s/%s", SYSFS_MNT_PATH, SYSFS_BUS_NAME,
  37                  SYSFS_BUS_TYPE, SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME,
  38                  attr_name);
  39
  40         if (add)
  41                 cmd_size = snprintf(command, SYSFS_BUS_ID_SIZE + 4, "add %s",
  42                                     busid);
  43         else
  44                 cmd_size = snprintf(command, SYSFS_BUS_ID_SIZE + 4, "del %s",
  45                                     busid);
  46
  47         rc = write_sysfs_attribute(match_busid_attr_path, command,
  48                                    cmd_size);
  49         if (rc < 0) {
  50                 dbg("failed to write match_busid: %s", strerror(errno));
  51                 return -1;
  52         }
  53
  54         return 0;
  55 }